Affected versions

• 85.0
• 86.0b2
• 87.0a1 (2021-01-27)

Affected platforms

• Windows 10
• macOS 10.11
• Ubuntu 18.04

Steps to reproduce

1. Go to https://hypem.com/latest
2. Select the name of the song on the bottom of the page or buttons from footer or header

Expected result

• Selected text is visible

Actual result

• The yellow highlight makes the selection indiscernible

Regression range

• Last good revision: 96b37ba12225d580f2b201d26915f88c5cb0d8a6 (2018-05-09)
• First bad revision: aabfe960ab59fea2e85896b1f8050786e16ab23b (2018-05-10)
• Pushlog:
  https://hg.mozilla.org/mozilla-central/pushloghtml?fromchange=96b37ba12225d580f2b201d26915f88c5cb0d8a6&tochange=aabfe960ab59fea2e85896b1f8050786e16ab23b

Probably "regressed" by unprefixing :-moz-selection in bug 509958.

This isn't a Firefox frontend bug, it's probably just a web compat issue, though I don't know off-hand why the behaviour is different from Chrome. Perhaps layout folks can have a look.

Blerg, so that page has:

::-moz-selection,
::selection {
  background: #ff9;
}

And of course chrome doesn't parse the ::-moz-selection selector, so that rule doesn't apply and chrome uses the default selection color. I contacted the page. Lacking that there's not much to do here.